Justice League of Arkham [Batman; Catwoman; Joker; Nightwing; Poison Ivy; Riddler; Ventriloquist; Scarface]; Justice League of Adventure [Flash [Wally West]; Beast Boy; Atom; Mr. Miracle [Scott Free]; Black Canary]; Advance Man
Synopsis
Batman notices that wherever the Advance Man goes, disasters follow, and now he's come to Gotham. Batman recruits Nightwing and 6 super-villains to stop him from unleashing a deadly, life-killing gas.